SauceOnDemand plugin has a credentialId parameter (see https://github.com/jenkinsci/sauce-ondemand-plugin/blob/master/src/main/java/hudson/plugins/sauce_ondemand/SauceOnDemandBuildWrapper.java), but job-dsl-plugin currently can't set it because it doesn't support credentialId (see https://github.com/jenkinsci/job-dsl-plugin/blob/master/job-dsl-core/src/main/groovy/javaposse/jobdsl/dsl/helpers/wrapper/SauceOnDemandContext.groovy).